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<?php //给定一个年月日,输出该日期是当年的第几天(注意闰年4 100 400) //可使用的技术路线:各类变量 例如数组 流程控制语句switch if else for Sy=2048;Sm = 5;Sd= 13: 2 下 Sx= 0; //todo:计算天数为x echo Sy.“年”.Sm.“月”.sd.“日是”.Sy.“年的第”.Sx.“天”: